Surgical helmet including an adjustment mechanism
US-12557865-B2 · Feb 24, 2026 · US
Air ducting systems
Air ducting systems · Cooperative Patent Classification (CPC)
Agriculture, food, personal care, health, and life sciences.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | A42B3/281 |
| Official title | {Air ducting systems} |
| Display label | Air ducting systems |
| Total patents | 48 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly growing.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 1 |
| 2017 | 1 |
| 2018 | 2 |
| 2019 | 5 |
| 2020 | 6 |
| 2021 | 2 |
| 2022 | 9 |
| 2023 | 8 |
| 2024 | 1 |
| 2025 | 9 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Hardhat with air conduit
US-2026027390-A1 · Jan 29, 2026 · US
Helmet and fabrication method
US-2025380760-A1 · Dec 18, 2025 · US
Hard Hat with Fan
US-2025288045-A1 · Sep 18, 2025 · US
Head covering device providing filtered air
US-12409351-B2 · Sep 9, 2025 · US
Hardhat with air conduit
US-2025249295-A1 · Aug 7, 2025 · US
Hood for hardhat and respirator apparatus
US-2025221486-A1 · Jul 10, 2025 · US
Conduit assembly for brimmed hardhat
US-2025212985-A1 · Jul 3, 2025 · US
Hardhat with shaped air conduit
US-2025213895-A1 · Jul 3, 2025 · US
Hard hat with fan
US-12336587-B2 · Jun 24, 2025 · US
Safety helmet fan system
US-12295448-B2 · May 13, 2025 · US
Hard Hat with Fan
US-2024251904-A1 · Aug 1, 2024 · US
Helmet comprising a segmented shell
US-11839257-B2 · Dec 12, 2023 · US
Safety helmet fan system
US-2023329386-A1 · Oct 19, 2023 · US
Safety helmet fan system
US-11717047-B2 · Aug 8, 2023 · US
Surgical Helmet Including an Adjustment Mechanism
US-2023111620-A1 · Apr 13, 2023 · US
Protective bicycle helmet with internal ventilation fit system comprising expanded connectors
US-2023086118-A1 · Mar 23, 2023 · US
Head Covering Device Providing Filtered Air
US-2023024861-A1 · Jan 26, 2023 · US
Device Providing Filtered Air for a User
US-2023028200-A1 · Jan 26, 2023 · US
Balanced Device Providing Filtered Air for a User
US-2023029404-A1 · Jan 26, 2023 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC A42B3/281?
- CPC A42B3/281 is the Cooperative Patent Classification code for “Air ducting systems.”
- How many patents are filed under CPC A42B3/281 (Air ducting systems)?
- Our database includes 48 publications tagged with this CPC code.
- Is patent activity under CPC A42B3/281 growing?
- Publication counts under this code: 1 in 2024 vs 9 in 2025 (latest complete years).